Hi all,
I have to access the register which are memory mapped for PCIe NTB in VxWorks. I have Linux code for accessing it but I am not able to understand hoe can we do it in VxWorks.

your guidance in it is highly appreciated by me, Thanks in advance.

linux pcie ntb driver to access the register is below:
Note: declaration in one structure :
struct __iomem *mmio_sys_info;

static int switchtec_init_pci(struct switchtec_dev *stdev,
struct pci_dev *pdev)
{
int rc;
void __iomem *map;
unsigned long res_start, res_len;
u32 __iomem *part_id;

rc = pcim_enable_device(pdev);
if (rc)
return rc;

//set mask 64 bit to get DMA transfer device
rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (rc)
return rc;

//enables bus-mastering for device dev
pci_set_master(pdev);

res_start = pci_resource_start(pdev, 0); //Returns bus start address for a given PCI region
res_len = pci_resource_len(pdev, 0); //Returns the byte length of a PCI region

if (!devm_request_mem_region(&pdev->dev, res_start,
res_len, KBUILD_MODNAME))
return -EBUSY;

stdev->mmio_mrpc = devm_ioremap_wc(&pdev->dev, res_start,
SWITCHTEC_GAS_TOP_CFG_OFFSET); //0 - 0x1000 //allocate mmio mrpc region from 0 to cfg offset
if (!stdev->mmio_mrpc)
return -ENOMEM;

map = devm_ioremap(&pdev->dev,
res_start + SWITCHTEC_GAS_TOP_CFG_OFFSET,
res_len - SWITCHTEC_GAS_TOP_CFG_OFFSET); //map = 0+0x1000-0x2000-0x1000
if (!map)
return -ENOMEM;

stdev->mmio = map - SWITCHTEC_GAS_TOP_CFG_OFFSET; //mmio = mrpc commands region till (map - 0x1000). mmio considered as a starting loc for GAS.
stdev->mmio_sw_event = stdev->mmio + SWITCHTEC_GAS_SW_EVENT_OFFSET; // mmio + 0x1800
stdev->mmio_sys_info = stdev->mmio + SWITCHTEC_GAS_SYS_INFO_OFFSET; //mmio + 0x2000
stdev->mmio_flash_info = stdev->mmio + SWITCHTEC_GAS_FLASH_INFO_OFFSET; //mmio+ 0x2200
stdev->mmio_ntb = stdev->mmio + SWITCHTEC_GAS_NTB_OFFSET; //mmio+0x10000

if (stdev->gen == SWITCHTEC_GEN3)
part_id = &stdev->mmio_sys_info->gen3.partition_id;
else if (stdev->gen >= SWITCHTEC_GEN4)
part_id = &stdev->mmio_sys_info->gen4.partition_id;
else
return -ENOTSUPP;

stdev->partition = ioread8(part_id);
stdev->partition_count = ioread8(&stdev->mmio_ntb->partition_count);
stdev->mmio_part_cfg_all = stdev->mmio + SWITCHTEC_GAS_PART_CFG_OFFSET; //mmio+0x4000
stdev->mmio_part_cfg = &stdev->mmio_part_cfg_all[stdev->partition]; //could be partition 0
stdev->mmio_pff_csr = stdev->mmio + SWITCHTEC_GAS_PFF_CSR_OFFSET; //mmio + 0x134000

if (stdev->partition_count < 1)
stdev->partition_count = 1;

init_pff(stdev); //doubt

pci_set_drvdata(pdev, stdev);

if (!use_dma_mrpc)
return 0;

if (!ioread32(&stdev->mmio_mrpc->dma_ver))
return 0;

stdev->dma_mrpc = dma_alloc_coherent(&stdev->pdev->dev,
sizeof(*stdev->dma_mrpc),
&stdev->dma_mrpc_dma_addr,
GFP_KERNEL);
if (stdev->dma_mrpc == NULL)
return -ENOMEM;

return 0;
}

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